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z in (-oo:+oo)
(2/3)*z = 1/21 // - 1/21
(2/3)*z-(1/21) = 0
(2/3)*z-1/21 = 0
2/3*z-1/21 = 0 // + 1/21
2/3*z = 1/21 // : 2/3
z = 1/21/2/3
z = 1/14
z = 1/14
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